package com.dang.alex.web.servlet.home;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dang.alex.model.Book;
import com.dang.alex.model.Category;
import com.dang.alex.model.Product;
import com.dang.alex.service.ProductService;
import com.dang.alex.service.ServiceDAOFactory;

@WebServlet("/main.do")
public class MainServlet extends HttpServlet {
	
	private static final long serialVersionUID = 4203324038024016589L;
	
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}
	
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String method = req.getParameter("method");
		Map<String,List>datas = new HashMap<String,List>();
		if (method != null) {
			switch(method) {
			case "1":
				productDetail(req, resp);
				break;
			default:
				break;
			}
		}else {
			initCategory(datas);
			initRecommend(datas);
			initHotBooks(datas);
			initNewBooks(datas);
			
			req.setAttribute("datas", datas);
			req.getRequestDispatcher("/WEB-INF/view/home/main.jsp").forward(req, resp);
			
		}
	}
	
	

	private void initNewBooks(Map<String, List> datas) {
		List<Book> books = new ArrayList<Book>();
		try {
			for(Product p : ServiceDAOFactory.getProductService().findByNew(4)) {
				books.add((Book) p);
			}
			datas.put("newBooks", books);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		
		
	}

	private void productDetail(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		Book book = null;
		try {
			String id = req.getParameter("id");
			if(id != null) {
				book = (Book)ServiceDAOFactory.getProductService().findById(new Integer(id));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		req.setAttribute("book", book);
		req.getRequestDispatcher("/WEB-INF/view/home/product.jsp").forward(req, resp);
		
		
	}
	
	
	private void initNewBook(Map<String, List> datas) {
		List<Book> books = new ArrayList<Book>();
		try {
			for(Product p:ServiceDAOFactory.getProductService().findByNew(4)) {
				books.add((Book) p);
			}
			datas.put("newBooks", books);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private void initHotBooks(Map<String, List> datas) {
		List<Book> books = new ArrayList<Book>();
		List<Product> pros;
		try {
			pros = ServiceDAOFactory.getProductService().findByHot(4);
			for (Product p : pros) {
				books.add((Book) p);
			}
			datas.put("hotBooks", books);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private void initRecommend(Map<String, List> datas) {
		List<Book> books = new ArrayList<Book>();
		ProductService productService = ServiceDAOFactory.getProductService();
		try {
			books.add((Book) productService.findById(new Random().nextInt(20) + 1));
			books.add((Book) productService.findById(new Random().nextInt(20) + 1));
			datas.put("books", books);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private void initCategory(Map<String, List> datas) {
		List<Category> cats;
		try {
			List<Category> list = ServiceDAOFactory.getCategoryService().findAll();
			cats = findByParentId(list, 1);
			for (Category c : cats) {
				c.setSubCats(findByParentId(list, c.getId()));
			}
			datas.put("category", cats);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private List<Category> findByParentId(List<Category> list,int id) {
		List<Category> subCats = new ArrayList<Category>();
		for (Category c : list) {
			if (c.getParentId() == id) {
				subCats.add(c);
			}
		}
		return subCats;
	}
}
